Cartridge-shell.



P. BUTLER GABTBIDGE SHELL.

A'PPLIOATIOK FILED mm: 18, 1912.

Patented Nov. 24, 1914.

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PAUL BUTLER, or LOWELL, MASSACHUSETTS.

CARTRIDGE-SHELL.

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Specification. of Letters Patent. Patented N 24 1914 Application filed June is, 1912. Serial No. 704,306.

To all whom it may concern Beit known that I, PAUL BUTLER, a citizen 1" ofsthe --.United 1 States, residingin Low-- ell, in the county of Middlesex and State of- Massachusetts, have invented an Improvement in Cartridge-Shells, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

The present invention relates to a cartridge shell, and is embodied in a so-called paper shell, the purpose of the invention being to aflord a simple means for allowing the paper tube to yield longitudinally when the explosiontakes place, so as to prevent the tube from bursting where it adjoins the end of the metallic cup which constitutes the head of the cartridge.

The shell embodying the invention comprises the usual drawn metallic cup which forms the head or breech end of the cartridge, and receives the paper tube which is inserted, and then fixed in place by the insertion of the breech wad which is crushed into position so as to clench the end of the paper tube in the flanged end of the metallic cup. In accordance with the invention, the paper shell is creased, indented or crimped at a point between the inner end and the outer end of the cup in which it is inserted, the crimped portion being between the breech wad, or that portion of the breech wad which is in contact with the tube, and the outer end of the cup. This Figure l is a longitudinal section, partly in elevation, of a cartridge shell embodying the invention; and Fig. 2 is a longitudinal section showing a modified construction.

Referring to Fig. 1, the cup at is of the usual constructiombeing indicated as drawn from a metal blank so as to be provided with the flange a and the primer recess a which has an annular shoulder a to support the anvil of the primer. The paper tube 5, which is inserted in the cup a after the usual construction, is provided with; a crimped or indented portion, as indicated at If, the crimped or indented iportion located as to lie between the breech wad and the open end of the cup a when the shell has been assembled.

In the construction shown in Fig. l, the parts are held in position by means of a wad c which is of novel shape, the said wad having a tubular projecting portion 0 which extends beyond the crimped portion 12 of the cup, and also beyond the main breech end of the wad where the opening through the primer seat terminates. This wad may be formed in the usual way by winding a strip of paper prior to its insertion in the shell and compressing the wound strip into position by a special die having an end which conforms to the shape shown in the drawing. This form of wad, however, is not essential, so far as relates to the longitudinal yielding of the paper tube to prevent the bursting thereof; and in Fig. 2 I have shown a modification in which the wad c is of the usual shape, and, in this case, the cup a is somewhat shorter, the crimped portion of the paper tube 6 lying, however, as before, between the face of the wad 0 and the open end of the cup. As a matter of construction, the crimp b (or there may be a plurality of such crimps, if desired) is formed in the tube prior to the insertion thereof into the cup. As a matter of fact, the crimp is smoothed or straightened out by the action of the compressing die when the wad is forced into place, but, in assembling the wad and cup, I have found that the crimp is restored, since the tube is forced inward endwise during the assembling operation; and, in any event, it has been proven by practical operation that the elongation of the cup provided by this construction is sufficient to relieve the lateral strain which sometimes tears the paper tube .open end of the cup and that part of the wad with which said tube is in contact, the

Q Limes? said crimped portion being out of contact tends forward from the primer opening with the cup. past, but not in contact with, the crimped 2. A cartridge shell comprising a metallic portion of the tube. cup provided with a primer seat; -a paper In testimony whereof, I have signed my a tube inserted in said cup and having a fname to this specification in the presence of 15 crimped portion within the cup; and a wad, two subscribing Witnesses.

the inner portion of which is in contact with PAUL BUTLER. the uncrimped inner portionof the tube, the Witnesses: said wad having an annular projecting por- JAMES B. RUSSELL,

10 tion of smaller external diameter which ex- ALBERT W. DAVIS.

Copies of this patent may 'be obtained for five cents each, of addressing the Commissioner of Patents,

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